I believe a "home" doesn't even have to be a house - some people refer to their city, region, or even country as home, maybe it also depends where they are when they say this.

That's an interesting concept, and one that's a bit unfamiliar to me! Personally, I couldn't wait to escape the small rural town I was raised in, so I don't think I ever considered it as home (well, I probably did in my younger childhood).